Mount Raung in western Indonesia erupted on July 16 while Mount Gamalama in eastern Indonesia also spewed powerful bursts of volcanic ash after remaining dormant since last December.

According to Sutopo Purwo Nugroho, spokesman of the National Disaster Management agency, Mount Raung spewed a column of ash that rose two kilometres in the sky and spread west and southwest of the crater.

Sutopo said authorities have banned the public from entering the slope of the volcano within a 3-kilometre radius from the crater as the alert status of Raung was raised to the second highest level.

On July 9, the Ministry of Transportation closed the Bali International Airport, about 150 kilometres from Mount Raung, and four other local airports as volcanic ash from the mount endangered aviation.

Meanwhile, Mount Gamalama in Ternate of North Maluku sent powerful bursts of volcanic ash up 1.5 kilometres in the sky which spread to the north of the crater.

The eruption was not followed by a spike in seismic activities at the volcano, which remains at the third highest alert level.

Authorities have banned people from entering a 1.5-kilometre radius of that slope.

Raung and Gamalama are among 129 active volcanoes in Indonesia.-VNA